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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98358787d838fa143141f347a9c6d0cd14dfff1979b984859a38d008b40a612a' 
  AND token = 'Gi5tclIft5qebTsSlP8Hf2uZLnMuJ6XLL9W6aYlkj9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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