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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4c7ffbc09b47489e9f152ee884e45f3bfe660ab717f8bc101a50d884e0a833' 
  AND token = '55+VXjlr1pvT3T11ZfjkhMUG0xqsvJ1ktXwrdO38OHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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