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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ae9a8bd37df625d26c63ed27e8e4be496814e6e30ee24061a15f0a6a630044' 
  AND token = 'aS7fYPpQQclOGdCATtikX41CoKZNTGn/X+9uBCfQUpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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