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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402c616287a786f1b70a9710f4f296216e56ec55b68416636d32350aeb55d52b' 
  AND token = 'YWThfbn5fNDBLc5Q2I+i2uqDv5+VJqpXKt3vq9vSqgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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