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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3482a570252e62c920affe14380abb0aa65395e90fd3803bc6c846ba9ed68f73' 
  AND token = 'BIsM9aOsqb0rJLh/cVGEVX6Or4cGF20dScPB32PrUx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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