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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f30213fe03b2157e298e26be6e1e9add8891cb38a9d3e0e797abf001227603e' 
  AND token = 'lwZtSiQVE8fu2Yf0t2Gl4E24y3rzAGnVSw2npiSlQK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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