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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62737b6d8e5cac568cfba43dbb70fb097de508ea0831182e8e0581e537a9ee5' 
  AND token = 'q62wBzOyXtKaF1fx/PfPmJSmDgr2w7EQDtiICDGxuJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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