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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df7c8c143ecdced0cadcc3e211ac449b883fcf4e46603e74721eb4494d26d0d' 
  AND token = '/+7YNjhjdZkKZO/UsmhflV7+sPfVMgJ9DaZV+mtv0uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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