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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa1bd93603c4ded5c5f1c10154a9f0be6c2ef5b38df529f0291ef32509750f0' 
  AND token = 'GXRPwdyRHgWEJruOt9fZci2bzXm775SNf79RAlah29c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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