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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556c1fc2db95f9a45beea3f89ab2e2d22aec04830817fb5b0011b59afc0a31a4' 
  AND token = 'oUfqe8jOdp1qwb9rW76K4yuNGkMECDPk08SP6Fgw4PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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