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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b473deadb225dfc32f46c7f3e70c7577da5e9c9c60d362cde0b1d03dccc2965' 
  AND token = 'DX91kKEqdW2VP7npKH8w9rgAkQVyNtputz0LOSoDDSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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