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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3c725486ae23e9a9af67a2d5871cfee5e6e350c9f2ae60c07742215f754351' 
  AND token = 'Okv/1bFxpQ+nh465p34WyIqdFy/G3N2fF3OBN5F1peo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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