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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bdc49478648e47f8325ca346d8916cf0ce89e382fea041ab2933ce41c078916' 
  AND token = 'XZJDBc4dfDQKxbw9Ln35httDD4FAKEu2RcSM0vR+Zho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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