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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd6afe8d7d8a09854e6fdbe700b09e2fa7a97f70b262a96a697f2031171d191' 
  AND token = 'bFTgxWezL7Ro8Z1NvP3YXjUxj8AZ4i6lPMltWRKaZIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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