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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b410cda4bac7f6d5189476dab9d65f355490e901a382ef5fdd0bf1916e63b41b' 
  AND token = 'jThY80Ebmx58ATRNfLTSmAdrfS4Rq7iN5G6wni6knq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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