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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc35427a0da724b0eec94b49c1c8aecda1a28f323566ed90c6d757d8d5d418ce' 
  AND token = 'uQnfPWwpBYIz5itlLGcI6t1hyoufDdtxw3FrQIYc5u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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