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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1c7d31f1a92a2472587da833b90772d0fe741fc09687e635ada80ca43c6b8b' 
  AND token = '6zoP/H77bLKrM4r62/DDzV7neUxMX8KvPjf2yfHduoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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