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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4075adc475e19526b3e491a7bb90a34f86232e8793450b542d9418a7c2bd9e7' 
  AND token = 'mnDRd3DbhJdS/Qtg1Hx/max2pY7aPtryRRkrVgbR2lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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