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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093eddb73bb93e7ac9f7d42e474bb5cc22510d91657c311292dec978b14255e4' 
  AND token = '/Px3HMZV/tSeFFUFeRtvvj2onSGqCIFmkyeMfV2BumM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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