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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfa4a953ea94a9c4aab97addc29532b0b0dd1b6d5333e41a689eb059bfcf712' 
  AND token = 'uFe9YnD9lyaHBT8fBkSROcDXVI1PauBrAokX819IfrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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