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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f070c2a38b18aac4ce3937c569c0431ace0ba02b2d69f6a8fc72f2e373a27448' 
  AND token = 'oJkGLETqpxencW6cpzdoDBgypXACej9CX53DKRfEfro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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