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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e30d5e52ee77330c892943f5a01255d84c79ab53a54b9c64fc199998256657' 
  AND token = 'eip6976JG1yXIL54/iBsZ4Kb7VAIebzqZyJrf7mGnFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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