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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314ac2f3df0a26c0fb7d7e8e75c99467b6ae3e7e0959eaecf06c485ff6ffcb83' 
  AND token = 'L5mi0eKf21tiP+dzqcr6TU4yPSHS94ehZOgS9dGDtmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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