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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5c65210480399a8254f18cb63500d3431227457b6bb1b0b6ff697603a54545' 
  AND token = 'L5mCq3AE168jVz/t4xZAT8LKGASzTv0WI4E8NRaz3to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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