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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d913af60ad5c1d791f21215f839e240a8b31c73e1839aaca1cbebaceb17cd0' 
  AND token = 'G7CbKv6jkNWz5jWmTdcLNKkpRVQ6GC0jTaD9NhwdSB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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