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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92cf11159d97f960cbb21b6b7ce73db7a37917943d041ce36662a2217802c691' 
  AND token = 'TvHvuPWShgsm4W/W2MdFkD11qcGK/bvVlCTH0bsfvkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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