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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8b0748cd08bbc30f0a76c34eee54860d64bb43db2dcfa07d4b6dfc53e8ab5e' 
  AND token = 'hV+DZwboUSCPb95JeSJtcPJeBbG0TL3t5NxqZ11RGqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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