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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1655aa1e42ec73e7ac209f28ab3e5e4959cf0cc46ac4884b952708582c618971' 
  AND token = 'zSVq+MYoyRc5FMvY3G1MQq6loP77Q6S1CdQI0Y1/Ud8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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