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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305a30f7fd3a739331cd09e77ccab3b4c2d1f43e624b61603035fbd7e4bb2447' 
  AND token = '7ZSiPM2qRdfAGQKW7qlvQgiTJXgzzUJ8UquJ3QIjVUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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