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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bdebc2fe1ef4cc12561b6834088df8d7bc60b71d6a31f5c71df6fd0fd3899e2' 
  AND token = 'atxePzSnm52iRf6xYI1MUODD+/1+h3RgaAmbVFR/1yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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