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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0115af0c2f6da40cbffba9b3f8f8361179df4f0ae379cac182eca22bf260df' 
  AND token = '/yeuTAN0G3Ee/xP9kmV5D9BlakuxKmjyD0+028l00ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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