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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2eb09300972a261fb965198f4c7a91fd616a8fc1a04f4f8f78bb1bc8488aad2' 
  AND token = 'J+RWNm4uKvNf7qjdBYEK4i79M4UMhL8oNYpPdmovx/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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