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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bfe7cca46ffd571756fcfff7654406b1c48978d36220b7c611d77adb1870c5d' 
  AND token = 'n71iyEAKlp1+9g2761uzT9xlGzrQ3+eLs15jHV3z0kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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