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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943d1c70966e59a418196601535c0c7983466899ab0b404180425f89808e0dcb' 
  AND token = 'Q5GlB9eagIIZA2Ww9XyjU/Sp7rD0ifAcf5sXEsAjqu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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