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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ac18cd943c9150383e6a60d742c347096d9171048d087e6cbf3e6e0748c6e1' 
  AND token = 'bVHxNW3eZRwPSJzDgA9+G3bRc1Def6yH8NE/B3kP+z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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