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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbeb3c61e374178beef9e1e02e06a9bf6fc808dcad441826a095bd6bea7b110' 
  AND token = 'A1LrCEXknzaXboqHt3uGhefTEDUXXh5JksAo7uu9wp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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