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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c1bdd56cb8bd6adce57e7dfcd20dfb4433a0a40074e3694f5aab91c19180b0' 
  AND token = 'mk/x69AL3QO04YUND1lot/3aTQxD+n2a5h8J3GerF/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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