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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787f87809785558aa210ed7a8c7b343a9a433cabe9ca8dac6a41da3e0b214b1b' 
  AND token = '1EiVWI53ilFddgYgqrOZLgwvSzne+OHkj7gfmgLeJWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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