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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e440f52d4ee2d10610da86ebb9563d967fb7ebdd02ee7545bb0e44e67cc5c89a' 
  AND token = '+JzObOdQiP3pU2Qg64txwiD0oa46wxYpebQlqsOjK1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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