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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5a369ea55b252a7f7a02f376621db92461532f315bbeca1d242c9100cba98e' 
  AND token = '7+YmNhF55zFCJH0gMurSu83RnTW21z2T7IcXlN55FFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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