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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b099e5eadd3e8f0c61851314bed0f0e0e82adc61a51470b7dab762ad480373' 
  AND token = '8RL3E12+LeG1g24D0KktTgU2Qjsr54GjSQ+3OPESUtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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