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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72a596cfd9218410e9bfbced7e3ef5b115226abecf23887e44f235032282b09' 
  AND token = 'RXv64JDLQfhsqz9e9K5cS9opuZpdp2zmWmlvczy7Bb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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