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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd12b54234a4c07a5225582ec55cea854d4ef45c0ab7b44d97993691824b9b6' 
  AND token = 'jWa/uBYsAa4CaZysuLP5pZDzzrFuOg19QoF/90kV7Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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