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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38c02abf8e18d58cce7f04afc0fd1af95663ec893a82516f3dc44ab9a841490' 
  AND token = 'iMfy6RyyijqGgfTRXAHrS3ar3y3S7ShZaHldmggt5ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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