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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80429ed5e60e4416df8f7663c909e8a2d17bb252eea20ceb4f4c81f0cd739475' 
  AND token = 'zoykWfu/Vq4a3lTebEYprjTBQ41yVAEJo+HYalmy/ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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