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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fe4bd5d9c7483550e9a7d6b5df8dedfd12fa3c717be6a5081a0f67aedf49c24' 
  AND token = 'IW3g29vMIzYJ4L4aNfTTAc8X/MH5qk2ktMRwMBehenA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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