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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f90ef89f986676ea6ff251efb951885ccb5f88456647d55f409864bf56cf4a1' 
  AND token = 'zd8q/bbnzCnsR7U8Pw1b00sK3OeZZCgqXQXZZO5a16E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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