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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8840e43bfbf43a74e7a333222a52b0e5b17d65ded45c7cd019c854db9f272f' 
  AND token = 'bv4rgiVEZrl8Kg378v6S1ehM/EDjOmgARBetHvlzqW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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