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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8e7e9105f488be5ab91ab5e527846f448f120f7743abfef8f713fbecb712b39' 
  AND token = 'GGagqZ+4C4i5AcXZHZOuaNRjNsoMS+k6N9NrBSV6AG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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