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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e7295a72ce33a87ec33f15f482d165fbc306937363fc7b246a2a6d303dddbca' 
  AND token = 'M8RXXZk5EBlEcDwa8+Pa/gROsoCaqYfibExf0wSXx6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}