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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f9981f0f684f1cc4d95a57af635a5a828c5d3c2dbd6619d244142a3a26692b' 
  AND token = 'GJs5I7Rv721hlK2y0BCAcRY8E8rIANMOH1T+FP/sO30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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