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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6c186e77e66dfc649f2cb18c4424baef15802061382835420209929e75730d' 
  AND token = 'J3BeAc/z9TWgyz9080kiXPsqUMVbcpwAP3KMEn41N6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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