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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0075f2a60890593e4fcc5a33ebd6f241fb4f37c60455e70181c56fbaa9657af2' 
  AND token = 'WoaSNBoDxpCk+Rsr7PXKdNdoV+5ISiWDb4SDcmxwxk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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