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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62229df17f4be078b1b82dec3d54a37141b044af60f20213aee0b2a38a60109c' 
  AND token = 'Hvi3Mr//WaZl4kiE/vHE9wHJdZF7nLDLBdYPaBJUd+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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